If given 1L of 90% EtOH, how would you prepare 250ml of 70% EtOH?
You need to make 150mls of a 70% ethanol solution of EtOH from a 95% solution. How would you do this?
From a 95% ethanol (ETOH) stock solution, you need to make 250 mL of 70% ETOH. How much stock and how much RO water do you need to make this solution- Show your work.
how many grams of dextrose are needed to prepare 250ml
of a 12.5% solution
Quiz: Unit 3 Qulz This Question: 1 pt 1 of 32 (1 complete)▼ How many milliliters of a 0.9 % sodium chloride solution contain 400 milligrams of sodium chloride? ⓔA. 4 mL O B. 44 mL ° C. 900 mL O D. 90 mL
3. Your instructor asks you to refill your spray bottle of 70% EtOH which holds 425 ml. You only have 95% EtOH available in the lab. How much 95% EtOH do you need? How much dH20? Show your calculations. C1V1 = C2V2
12. Describe how to prepare a 250mL 0.350M of oxalic acid solution using oxalic acid dihydrate solids (H2C204.2H20, molar mass = 126.06g/mol) You need to describe appropriate glassware in your preparation. 13. Describe how you would prepare 500. mL of 0.10M of HCl solution from 3.0M of HCI stock solution. You need to describe appropriate glassware in your preparation.
How would you make 1L of 0.1N NaOH solution from an 18N stock solution?
How would you prepare a 1 M solution of ethanol from a 90% (v/v) stock? (MW = 46, d = 0.789)
How will you make a 1L of a 6M solution of sucrose? The molecular weight of sucrose is 342.2965 g/mol. If you start with the sucrose powder, how would you make this?
how it is 90/70 please explain with formula
Ε(ay) - ΣΣ κ.ν.f(x,y) 18 36 6 18 12 70 70 70 70 70 90 90 1ος 14 Step 1 of 5 0 h(y) 0 1 2 3 0 3/709/703/70 15/70 2/70 18/70 18/702 /7040/70 3/709 /703/70 0 15/70 5/70 30/70 30/70 5/701 1 2 g(x) Comment
heat 1. 03 2. (CH3)2 A NaoEt EtOH - H20 Show how you would bring about this conversion by drawing the structure of B. You do not have to consider stereochemistry.